Improved drilling-machine



UNITED STATES ATENT OFFICE.

IMPROVED DRlLLlNG-MACHINE.

Specication forming part of Letters Patent No. 53,981, dated April17, 1866.

To all whom it may concern:

BeitknownthatLT. M. HOWARD,ofOharles town, Chester county, Pennsylvania, have invented an Improved Drilling-Machine and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying dra7A ings, and to the letters of reference marked thereon.

My invention consists of a drilling-machine constructed and operated inthe manner described hereinafter, the machine being simple in construction and well adapted for use in a blacksmiths or other shop, where a more expensive machine for accomplishing the same duty would be out of place.

1n order to enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this specification, Figure l is a front view of my improved drilling-machine, and Fig. 2 a side view.

The frame of the machine consists of the base A, the standard B, and shorter standard D, all of which I prefer to make of wood.

A platform, E, is arranged to slide between the two standards, which have grooves for the reception of the edges of the said platform, and on the under side of the latter is a rack, a., into which gear the teeth of a wheel, b, on a shaft which turns in the two standards, and which is furnished with a suitable handle, d. To thefrontof the standard B is secured a plate, G, from which project bearings e e', adapted to the vertical drill-spindle H, which can move up and down in the hub of the bevel-wheel I, but cannot turn independentlyv ot' the said wheel, the latter gearing into a bevel-wheel, J, on a shaft, K,which turns in the plate G, and in another plate secured to the back of the standard B, and which is furnished with a handled iiy-wheel, j'. The bevel-wheel I is maintained in its proper vertical position in one direction by the bearing c, and in the other direction by a bar, h, which forms a part of the plate G.

In a projection, fi, of the plate G slides a rack, M, into the teeth of which gear those of a cog-wheel, m, on a spindle, n, the latter turning in lugs on the same projection t', and this rack is so coupled to the drill-spindle H that the latter can revolve freely, but can have no vertical movement independent of the rack. The frontend of the spindle nis enlarged, and on this enlarged end a lever, N, is hung loosely, another lever, P, being hung to the lever N, and a spring, q, on the latter tending to force the outer end of the latter upward. rEhe inner end of the lever P is provided with a pin, t, which passes through the'hub of the lever N, and into one of four holes, u, in the enlarged end of the spindle n.

A drill having been adjusted to the lower end of the spindle H, and the object to be 0peratcd on having been placed on the platform E, the attendant with one hand turns the flywheel f, and with the other depresses the lever N, and consequently the spindle H and its drill. When the lever N cannot be further depressed without inconvenience to the operator, he places his thumb on the outer end of the lever P and depresses the same, thereby withdrawing the pin t from that hole u in the enlarged end of the spindle n in which it had hitherto occupied a position. The lever N is then elevated until the pin t coincides with another hole, u, when the lever P is released and the lever N depressed, and the depression of the drill continued, as before.

It will be seen without further description that the machine is of the most simple construction, and well adapted for use in blacksmiths and other shops, where a more expensive machine for accomplishing the same duties would be out of place.

I claim as my invention and desire to secure by Letters Patentrlhe combination of the lever N, leverP, with its pin t, spindle n, with its' holes w, wheel m, sliding rack M, and drill-spindle H, the whole bein g arranged and operating substa ntiall y as and for the purpose herein set forth.

In testimony whereofI have signed myname to this specification in the presence of two subscribin g witnesses.

y THOS. M. HOWARD.

Witnesses:

J oHN WHITE, W. J. R. DELANY. 

